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I recieved some very good info on my last question I thought I would try again. Reloading for the M1A1. I am starting with IMR 4895 pushing a 168 gn BTHP Match. My information list CCI Lg Rifle Primers #200. I know CCI makes a #34 Lg Rifle for slam fire problems with military rifles. These have a hardened base to help with the floating firing pin. They list as equilivent to LR Magnum primers. Does anyone know about these primers and how they would effect pressure and charge weight changes? My plans was to use 41.5 gns of IMR 4895 as a starting point in regular unfired remington brass.
 

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load 20 rounds with the #200and obeserve what happens,load the mag fire the first, eject the second, fire the third, eject the fourth, and so on, see if the unfired rounds are dimpled. then adjust what you want accordingly.
 
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